From the Web form feedback:

one involves the search feature. If you make a search for an object, and then you do the same for some more objects, then there is no search-history on the input-LineEdit-field and no history for the RESULTS (result-history is more important). There is so much space after the "Expand All" button that you could probably organize the search-RESULT-history as tabs (that can also be closed) or like the new way that you mostly use in qt-creator, in a combobox-like solution.